Oskoruš families are Croats and they are mostly from Grubisno Polje area. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Ogulin.
Prevalence
About 80 people with faimily name Oskoruš live in Croatia today, in 30 households. There were 80 of them in the middle of the past century, and their number remains constant. They are located in 9 Croatian counties, in 7 cities and 11 other places, mostly in Varazdin (15), Ogulin (10), Zagreb (<5), Rijeka (<5), and in Zapresic (<5).
Outside Croatia
Family name Oskoruš is present in four countries on two continents. The family name "Oskorus " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.